Lamp-support.



K. J. .OHLSON, LAMP SUPPORT.

APPLICATION FILED NOV. 4, 1912.

Patehted Nov. 25, 1913.

KARL JOI-IAN OI- ILSON, OF CHICAGO, ILLINOIS.

LAMP-SUPPORT.

Specification of Letters Patent.

Patented Nov. 25,1913.

Application filed November 4, 1912. Serial No. 729,284.

sary to prevent disturbing vibrations of the lamp and yet provides allthe necessary adjustments longitudinally from as well as angularly tothe wall or base of said support.

With the above named object in view my invention consists in the novelconstruction, combination and arrangement of parts hereinafter describedin detail, illustrated in the accompanying drawing and incorporated inthe appended claims.

In the drawing-Figure 1 is a section on line 11 of Fig. 2. Fig. 2 is aside view of the arm, bracket or lamp support embodying my invention,the base-plate being shown in section. Fig. 3 is a top plan view ofsame. Fig. 4 is an enlarged detail view broken away, showing the methodof holding the longitudinally adjustable extensionrod. Fig. 5 is asimilar view showing a modification. Fig. 6 is a section taken on line66 of Fig. 2, on an enlarged scale. Fig. 7 is a section taken on line 77of Fig. 2 and enlarged.

In the several views 2 represents a triangular base-plate, which may beconveniently made out of wood. Same is fastened by screws 3, 3 to a Wallor other suitable stationary object. Hinged on screw-eyes, or othersuitable joints, 4 and 5 are a series of rods 6, 7 and 8 which arecurved as shown in Figs. 2 and 3, to meet or form a bundle or clusterwith a rod or pole 9 in the periphery of which are grooves 10, 11 and 12which extend the full length of said rod or pole and receive the rods 6,7, and 8, respectively. The bundle thus formed of rods 6, 7, 8, and 9 isclamped together at the point where said rods cluster, by a band 13having ends 14 and 15 engaged by a bolt and butter-fly nut 16 wherebysaid band may be contracted or clamped upon the cluster of rods. A tightclamping will make the rods substantially immovable longitudinallyrelative to each other while a moderate contraction of the said bandwill permit the rods 6, 7, and 8 to slide or move longitudinallyrelative to each other in their channels or grooves 10, 11 and 12. Thecenter rod 9 of the cluster is movable longitudinally relative to theother three rods supported on said center rod to lengthen or project thereach of the lampsupportor arm composed of said four rods. The rod' 9may be thus adjusted to lengthen or shorten the arm to the extent of thedistance between the clamp 13 and the baseboard2. Provision is made foradditional lengthening of the arm in the form of an extension rod 17mounted on eyes 18 and 19, or screw-eyes screwed into the rod 9 asshown. The forward end of the extension rod 17 has secured therein anopen screw-eye 20 adapted to receive the cord or other suitable part ofan electric, lamp. The rod 9 is similarly equipped with a hook or eye 21forthe same purpose.

The principal support for an electric light bulb is near the end of therod 9, and consists of a wire or metal rod having a straight shankportion 22 and a curved portion 23, which forms an are slightly largerthan a half circle and adapted to engage the socket portion 2 1 of anelectric light bulb and hold it with a spring-grip. The part 23 willtherefore be made with suflicient flexibility to grip the neck of thebulb with a moderate frictional engagement. The shank 22 is held so thatit may be adjusted rotatably on and angularly about its axis by means ofa bolt 25 having an elongated or round hole therein for the shank 22. Awasher 27 is interposed between the shank 22 and pole or rod 9 and thiswasher is provided with a hole 28 large enough to permit the head 29 ofthe bolt to pass through it, thus clamping the shank 22 between thewasher and the head. The head of the bolt is drawn against the shank 22by means of a thumb-nut 30 on the threaded end 31 of the bolt. Betweensaid nut and the rod is interposed another washer 32.

In Fig. 6 the bolt for tightening the clamp 13 is shown with a wingedhead 16 engaging the end or lug 14, while the threaded portion 33 of thebolt has threaded engagement with the lug 15. The extension rod 17 isshown in Fig. 3 as held by a bolt 84 having threaded engagement with therod 9 and bearing against the rod 17. The bolt is turned by means of awinged head 35.

All of .the parts may be adjusted to the.

weightof the arm as a whole to permit the different adjustments oflengthening or shortening the arm'by means ofthe rods 9 -an'cl'17and'swinging the arm in anydesired "direction, so thatthe frictionalengagement will be suflicient to support the rods in the positions theyareplaced and yet permit "their relative sliding movement withoutloosening the clamps.

As the above-described construction involves principally the use ofwooden strips,

rounds or rods, although adapted for metal rods 'aswell,the'inventionm'ay be manutactured at a comparatively small'cost. The

spread of the rods'to the corners of the baseboard gives the'arm atruss-support in what- 7 ever position it is placed, and the longitudi-'nal adjustmentof the rod 9 relative to the rods 6,7 and 8 affords arange of adjustin'ent"as to reach which is ample for all ordinarypurposes without'resorting to the use of the rod 17. Where it isdesirable to place the arm high and let the lamp drop some distancebelow the end thereof the Books or eyes in'the end of the arm willsupport the lamp cord conveniently by simply winding said cord about'thehook one turn. "Having thus described my invention, I

claim as new and desire to secure by Letters Patent 1. The combinationwitha stationary support, of an arm consisting of a center rod and aplurality of rods relatively slidable on said center rod andformingtherewith a bundle of rods or spindles held together byfrictional engagement, said rods bein spread apart each separatelyjointed to said support for movement angularly relative thereto, meansforclamping said rods together against movement longitudinally relativeto each other, and means for clamping an electric light-bulb onthe freeend of said arm.

' 2. The combination with a base-board, of means for fastening saidboard to a wall or the like, a series of rods or spindles movablyjointed to the corners of said base board, a clamp clamping the majorportion of said rods together, a rod 9 to which said rods are-clamped,said rod 9 having grooves therein toreceive said rods, an extension rodmounted on said rod 9, means for adj ustably clamping said rod 9 andextension rod together, means upon said rod 9 for clamping an electriclight bulb removably thereto, means in addition thereto on said rod 9for supporting an electric light bulb cord, and

similar means on said extension rod.

' K ARL JQHAN oHLsoN. Witnesses:

"Fnrrz EMANUEL YOUNGGREN,

J. W. BECKSTROM. I

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

it i i 7' i I .We hingmn;n.'c.-'--

